Home / 20,391.56-28,141.66-11,317.28

Finding the Fourth Proportional to 20,391.56, 28,141.66 and 11,317.28

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Solution

The fourth proportional to 20,391.56, 28,141.66 and 11,317.28 is: 15,618.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,391.56 : 28,141.66 = 11,317.28 : x
  2. Step 2: Convert to fraction form
    20,391.56/28,141.66 = 11,317.28/x
  3. Step 3: Cross multiply
    20,391.56x = 28,141.66 × 11,317.28
  4. Step 4: Simplify right side
    20,391.56x = 318,487,045.88
  5. Step 5: Solve for x
    x = 318,487,045.88/20,391.56
  6. Step 6: Final answer
    x = 15,618.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.